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Posted to issues@tez.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2015/03/19 08:24:38 UTC

[jira] [Updated] (TEZ-2209) Fix pipelined shuffle to fetch data from any one attempt

     [ https://issues.apache.org/jira/browse/TEZ-2209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rajesh Balamohan updated TEZ-2209:
----------------------------------
    Attachment: TEZ-2209.1.patch

[~sseth] - Please review when you have time.

> Fix pipelined shuffle to fetch data from any one attempt
> --------------------------------------------------------
>
>                 Key: TEZ-2209
>                 URL: https://issues.apache.org/jira/browse/TEZ-2209
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>         Attachments: TEZ-2209.1.patch
>
>
> - Currently, pipelined shuffle will fail-fast the moment it receives data from an attempt other than 0.  This was done as an add-on check to prevent data being copied from speculated attempts.
> - However, in some scenarios (like LLAP), it could be possible that that task attempt gets killed even before generating any data.  In such cases, attempt #1 or later attempts, would generate the actual data.
> - This jira is created to allow pipelined shuffle to download data from any one attempt. 



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